Malicious PDF — malware analysis report

Static analysis result for SHA-256 8649ca051fb0af2b…

MALICIOUS

PDF

68.6 KB Created: 2021-09-25 01:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 82005e2521fecd923d7278d33613b46c SHA-1: f77e580cc3acad4317f2ffc550d405114a06dae0 SHA-256: 8649ca051fb0af2b763f5e8efba29a7f112d4e1ca09e7a2c0a02971749999c57
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct domains, with a high concentration of external URIs. While no scripts were directly extracted, the PDF structure and its association with phishing suggest it likely contains embedded JavaScript or exploits to redirect users to malicious sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://trade.inter-ural.ru/ckfinder/userfiles/files/53984271046.pdf In PDF document text
    • https://cooperspick.com/files/54742153882.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wivikejotijupokikora.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210925052927.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/zumotowizavitemepob.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/vumazotavovetowuzijesiwut.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/4692625325.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///duseluve.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/35416705408.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/81750310097.pdfIn PDF document text
    • http://handinks.com/ckfinder/images_store/files/37942569746.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/45723865849.pdfIn PDF document text
    • https://linardi.ru/files/file/revufujafutelutenot.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/52056092629.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/xiger.pdfIn PDF document text
    • http://canadianrockies.info/files/file/28737893232.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/wevexaxopubi.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/dikiz.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/zezefadegaseduwaf.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/57626050632.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/19381696817.pdfIn PDF document text
    • http://expresskaliski.info/file/winuxolevujodotofuzodujen.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/bijafinibewuxokegi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=modded+online+gamesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB08F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A6 10384 bytes
SHA-256: e7b2311562964812e8670584fd81c2e3372e8f7a9fbca8766043c09ff0960792
font_02_sfnt_off0000dfd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD1 14728 bytes
SHA-256: 9d43dbdd5a78ee60e63c0aab265285d6927ee46452f7a7f323b94207948ce5a4

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